Voter registration activists fanned out among young Americans who marched for tighter gun laws Saturday, signing up thousands of first-time voters who vowed to eject lawmakers who oppose gun controls.

With midterm congressional elections eight months away, the activists flocked to some 800 marches across the country to enroll young voters likely to back Democratic and independent candidates who tend to favor tougher firearms laws.

In Washington, volunteers for the HeadCount voter-registration effort raised their fists and chanted "demonstration without registration leads to frustration" before heading out with clipboards to sign up some of the nation's newest voters.